// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/android/background_sync_network_observer_android.h"

#include "base/android/context_utils.h"
#include "jni/BackgroundSyncNetworkObserver_jni.h"

using base::android::JavaParamRef;

namespace content {

// static
bool BackgroundSyncNetworkObserverAndroid::Observer::RegisterNetworkObserver(
    JNIEnv* env)
{
    return RegisterNativesImpl(env);
}

// static
scoped_refptr<BackgroundSyncNetworkObserverAndroid::Observer>
BackgroundSyncNetworkObserverAndroid::Observer::Create(
    base::Callback<void(net::NetworkChangeNotifier::ConnectionType)> callback)
{
    DCHECK_CURRENTLY_ON(BrowserThread::IO);
    scoped_refptr<BackgroundSyncNetworkObserverAndroid::Observer> observer(
        new BackgroundSyncNetworkObserverAndroid::Observer(callback));
    BrowserThread::PostTask(
        BrowserThread::UI, FROM_HERE,
        base::Bind(&BackgroundSyncNetworkObserverAndroid::Observer::Init,
            observer));
    return observer;
}

void BackgroundSyncNetworkObserverAndroid::Observer::Init()
{
    DCHECK_CURRENTLY_ON(BrowserThread::UI);
    // Attach a Java BackgroundSyncNetworkObserver object. Its lifetime will be
    // scoped to the lifetime of this object.
    JNIEnv* env = base::android::AttachCurrentThread();
    base::android::ScopedJavaGlobalRef<jobject> obj(
        Java_BackgroundSyncNetworkObserver_createObserver(
            env, base::android::GetApplicationContext(),
            reinterpret_cast<jlong>(this)));
    j_observer_.Reset(obj);
}

BackgroundSyncNetworkObserverAndroid::Observer::~Observer()
{
    JNIEnv* env = base::android::AttachCurrentThread();
    Java_BackgroundSyncNetworkObserver_removeObserver(
        env, j_observer_, reinterpret_cast<jlong>(this));
    DCHECK_CURRENTLY_ON(BrowserThread::UI);
    j_observer_.Release();
}

void BackgroundSyncNetworkObserverAndroid::Observer::
    NotifyConnectionTypeChanged(JNIEnv* env,
        const JavaParamRef<jobject>& jcaller,
        jint new_connection_type)
{
    DCHECK_CURRENTLY_ON(BrowserThread::UI);
    BrowserThread::PostTask(
        BrowserThread::IO, FROM_HERE,
        base::Bind(callback_,
            static_cast<net::NetworkChangeNotifier::ConnectionType>(
                new_connection_type)));
}

BackgroundSyncNetworkObserverAndroid::Observer::Observer(
    base::Callback<void(net::NetworkChangeNotifier::ConnectionType)> callback)
    : callback_(callback)
{
    DCHECK_CURRENTLY_ON(BrowserThread::IO);
}

BackgroundSyncNetworkObserverAndroid::BackgroundSyncNetworkObserverAndroid(
    const base::Closure& network_changed_callback)
    : BackgroundSyncNetworkObserver(network_changed_callback)
    , weak_ptr_factory_(this)
{
    DCHECK_CURRENTLY_ON(BrowserThread::IO);

    // Remove the observer attached by the NetworkObserver constructor
    net::NetworkChangeNotifier::RemoveNetworkChangeObserver(this);

    observer_ = Observer::Create(
        base::Bind(&BackgroundSyncNetworkObserverAndroid::OnNetworkChanged,
            weak_ptr_factory_.GetWeakPtr()));
}

BackgroundSyncNetworkObserverAndroid::~BackgroundSyncNetworkObserverAndroid()
{
    DCHECK_CURRENTLY_ON(BrowserThread::IO);
}
} // namespace content
